Something with the use of the satnav that is still puzzling is the interpretation of the route colour codes when viewing and selecting the preferred route.
The routes are in four categories : Fastest - Shortest - Time/Distance - and Eco.
These are individually shown on the screen before making the preferred selection, with different colours.
Sometimes the routes offered are all virtually identical so making a choice is not difficult, but for other journeys they may differ quite significantly and then it can sometimes be difficult to decide which of the displayed coloured routes corresponds to the Fastest - Shortest etc identities.